Transportation

SF 378 increases Iowa's default speed limit for all vehicular traffic from 55 mph to 60 mph on roads without specific posted limits. This affects all drivers traveling on most state highways and roads where no special speed zones (like school districts at 25 mph or interstates at 70 mph) apply. The bill also allows transportation agencies to temporarily use approved stickers on existing signs when updating speed limits, rather than replacing signs immediately. It does not change existing speed limits for specific areas (like school zones) or penalties for speeding violations.